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Obstet Gynecol. 1992 Aug;80(2):283-5.

Oxygen measurements in endometrial and trophoblastic tissues during early pregnancy.

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Department of Obstetrics and Gynecology, University Hospital Erasme, Brussels, Belgium.


Placental and endometrial partial pressures of oxygen (PO2) were measured using a polarographic oxygen electrode during the first trimester of pregnancy. Between 8-10 weeks' gestation, placental PO2 levels were significantly lower (P less than .001) than endometrial levels. A significant (P less than .001) increase was observed for placental PO2 values measured at 12-13 weeks compared with those obtained at 8-10 weeks. We suggest that the increase of placental PO2 at the end of the first trimester is related to the establishment of continuous maternal blood flow in the intervillous space.

[Indexed for MEDLINE]

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